Trajectory analysis. Ivan Kukanov
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1 Trajectory analysis Ivan Kukanov Joensuu, 2014
2 Semantic Trajectory Mining for Location Prediction Josh Jia-Ching Ying Tz-Chiao Weng Vincent S. Tseng Taiwan Wang-Chien Lee Wang-Chien Lee USA Copyright 2011 ACM 2/41
3 The next location prediction approaches Personal-based prediction[1] General-based prediction [2,3] Note: further consider General-based prediction Semantic Trajectory Mining for Location Prediction 3/41
4 Semantic Trajectory Mining for Location Prediction predicting the next location of a user s movement Input: GPS user s trajectories Semantic Trajectory Mining for Location Prediction 4/41
5 Geographical and Semantic similarity Example: T 1 and T 2 geograficaly, T 2 and T 3 semantically Semantic Trajectory Mining for Location Prediction 5/41
6 SemanPredict framework Offline and Online Modules Novel prediction strategy: Semantic and Geographic trajectory patterns MIT reality dataset [4] 106 mobile users Over 500,000 hours Semantic Trajectory Mining for Location Prediction 6/41
7 SemanPredict: offline module 1. Data preprocessing 2. Semantic mining 3. Geographic mining Semantic Trajectory Mining for Location Prediction 7/41
8 SemanPredict: offline module 1. Data preprocessing: GPS trajectories to stay locations sequence [1, 5] Output: T 1 =<S 0, S 1, S 2 > ; T 2 =<S 0, S 4, S 3 >; T 3 =<S 0, S 5, S 4, S 3 >; Semantic Trajectory Mining for Location Prediction 8/41
9 SemanPredict: offline module 2. Semantic mining: 2.1. Assign semantic labels to stay locations using gazetteer [6]; Example: Input: T 1 =<S 0, S 1, S 2 > ; T 2 =<S 0, S 4, S 3 >; T 3 =<S 0, S 5, S 4, S 3 >; Output: T 1 =<School, Park, Stadium> ; T 2 =<School, Bank, Hospital>; T 3 =<School, Unknown, Bank, Hospital>; Semantic Trajectory Mining for Location Prediction 9/41
10 SemanPredict: offline module 2. Semantic mining: Example: result semantic labels Semantic Trajectory Mining for Location Prediction 10/41
11 SemanPredict: offline module 2. Semantic mining 2.2. Similar User Clustering Complete linkage clustering Similarity measure: Maximal Semantic Trajectory Pattern Similarity [6] Semantic Trajectory Mining for Location Prediction 11/41
12 SemanPredict: offline module Example: Longest Common Sequence(LCS) P = <School, Park, Stadium>, Q = <School, Bank, Park, Shop> LCS(P, Q) =<School, Park> ratio P ratio Q dist P, Q Semantic Trajectory Mining for Location Prediction 12/41
13 SemanPredict: offline module 3. Geographic mining Input: - stay location sequence - clusters from semantic mining 3.1. Grouping Users Stay Location Sequences (Prefix-Span [9]) Output: clusters of stay location sequence based on semantic clusters Semantic Trajectory Mining for Location Prediction 13/41
14 Recap SemanPredict: offline module Input: GPS user s trajectories Semantic Trajectory Mining for Location Prediction 14/41
15 SemanPredict: online module Semantic Trajectory Mining for Location Prediction 15/41
16 SemanPredict: online module Input: the trajectory of the user s recent moves Semantic Trajectory Mining for Location Prediction 16/41
17 SemanPredict: online module Matching score: Score GeographicScore 1 SemanticScore, where 0 1 Note: how well the user behavior matches model Semantic Trajectory Mining for Location Prediction 17/41
18 Summarizing Trajectories into k-primary Corridors: A Summary of Results Michael R. Evans Dev Oliver Francis Harvey USA Copyright 2012 ACM 18/41
19 Why k-primary Corridors? Identifying potential avenues for access Determine bus, metro and railway systems corridors Summarizing Trajectories into k-primary Corridors: A Summary of Results 19/41
20 Road network Graph G = {V, E} Nodes = road intersections Basic concepts Track GPS trace to series of nodes and edges of road network Primary corridor Representative track of group of other tracks (Medoid) Summarizing Trajectories into k-primary Corridors: A Summary of Results 20/41
21 Example: Road Network 7-Primary Corridors Summarizing Trajectories into k-primary Corridors: A Summary of Results 21/41
22 Given Road Network: G = {V, E} Collection of Tracks: T Number k Find k-primary Corridors Constraints Problem statement Each primary corridor is track itself from set T G is a connected graph with nonnegative weights Summarizing Trajectories into k-primary Corridors: A Summary of Results 22/41
23 Input: see Given Solution 1. Compute the track similarity matrix 2. Modified k-medoid clustering [7] Note: bottleneck is the track similarity matrix computation Summarizing Trajectories into k-primary Corridors: A Summary of Results 23/41
24 Example: time comparison of steps in k-primary Corridor problem (100 nodes/tracks, k=5) 94% Summarizing Trajectories into k-primary Corridors: A Summary of Results 24/41
25 Approaches to compute the Track Similarity Matrix Graph-Node Track Similarity (naïve approach) 1. Consider all track pairs (t i,t j ) 2. For each pair of nodes in tracks (t i,t j ) run Dijkstra Note: O(N 2. N 2. N. logn) Summarizing Trajectories into k-primary Corridors: A Summary of Results 25/41
26 Example: track similarity matrix computation Summarizing Trajectories into k-primary Corridors: A Summary of Results 26/41
27 Example: track similarity matrix computation (cont.) Transform to graph (for simplicity all weights equal 1) Summarizing Trajectories into k-primary Corridors: A Summary of Results 27/41
28 Example: track similarity matrix computation (cont.) Calculate track similarity function 1 t m t j, min, i j ShortestPath n m s t t i n t i n, m nodes of tracks t i, t j respectively Summarizing Trajectories into k-primary Corridors: A Summary of Results 28/41
29 Approaches to compute the Track Similarity Matrix Matrix-Element Track Similarity 1. Consider all track pairs (i, j) 2. Attach a virtual node to track i 3. Run single Dijkstra from the virtual node to all the nodes in track j 4. Compute track similarity metric Note: O(N 2. N. logn) Summarizing Trajectories into k-primary Corridors: A Summary of Results 29/41
30 Example: track similarity matrix computation Summarizing Trajectories into k-primary Corridors: A Summary of Results 30/41
31 Example: track similarity matrix computation (cont.) Calculate track similarity function 1 s t, t dist[ m] i j t i m t j dist[m] distance from node m in tracks t j to its closest node in track t i Summarizing Trajectories into k-primary Corridors: A Summary of Results 31/41
32 Detecting Road Intersections from GPS Traces Alireza Fathi John Krumm Microsoft Research USA /41
33 Problem definition 1. GPS data collecting Expensive: Specialized vehicle Keep up with changes in the road Chip: Regular vehicle Detect road intersection Detecting Road Intersections from GPS Traces 33/41
34 Problem definition Input: GPS data of regular vehicles 2. Infer the road network from GPS traces: Graph G = {V, E} Nodes = road intersections Goal: detect road intersections Detecting Road Intersections from GPS Traces 34/41
35 Example: GPS data of regular vehicles Detecting Road Intersections from GPS Traces 35/41
36 Example: Local Shape Descriptor with 32 bins Sliding over GPS data to detect intersection Detecting Road Intersections from GPS Traces 36/41
37 Training phase Input: examples of GPS trace with intersections and non-intersections 1. Sliding by shape descriptor over examples 2. Map the bins to the feature vector 3. Learn classifier (Adaboost [8]) Detecting Road Intersections from GPS Traces 37/41
38 Example: result on test dataset Detecting Road Intersections from GPS Traces 38/41
39 Thank you for your attention! 39/41
40 References 1. Yang Ye*, Yu Zheng, Yukun Chen, Jianhua Feng, Xing Xie. Mining Individual Life Pattern Based on Location History. In proceedings of the International Conference on Mobile Data Management 2009 (MDM 2009). IEEE, E. H.-C. Lu and V. S. Tseng. Mining Cluster-Based Mobile Sequential Patterns in Location-Based Service Environments. MDM, A. Monreale, F. Pinelli, R. Trasarti, F. Giannotti. WhereNext: a location predictor on trajectory pattern mining. KDD 2009: N. Eagle, A. Pentland, and D. Lazer. Inferring Social Network Structure using Mobile Phone Data. In proceedings of the National Academy of Sciences (PNAS),106(36), pp , Y. Zheng, L. Zhang, and X. Xie. Recommending friends and locations based on individual location history. ACM Transaction on the Web, J. J.-C. Ying, E. H.-C. Lu, W.-C. Lee, T.-C. Weng, V. S. Tseng. Mining User Similarity from Semantic Trajectories. In Proceedings of ACM SIGSPATIAL International Workshop on Location Based Social Networks (LBSN' 10), San Jose, California, USA, November 2, Detecting Road Intersections from GPS Traces 40/41
41 References 7. L. Kaufman, P. Rousseeuw, et al. Finding groups in data: an introduction to cluster analysis, volume 39. Wiley Online Library, Viola, P. and M. Jones, Rapid Object Detection using a Boosted Cascade of Simple Features, in Computer Vision and Pattern Recognition (CVPR 2001) p. I-511- I J. Pei, J. Han, B. Mortazavi-Asl, H. Pinto, Q. Chen, U. Dayal, and M.C. Hsu. PrefixSpan: Mining sequential patterns efficiently by prefix-projected pattern growth. In Proceedings of the 17th International Conference on Data Engineering (ICDE), 2001, Detecting Road Intersections from GPS Traces 41/41
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